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add shallow fusion (#147)

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This commit is contained in:
PF Luo
2023-05-10 22:30:57 +08:00
committed by GitHub
parent 7969cf44ac
commit 824b0809a4
9 changed files with 104 additions and 125 deletions
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28
sherpa-onnx/csrc/online-lm.h
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@@ -21,29 +21,27 @@ class OnlineLM {
static std::unique_ptr<OnlineLM> Create(const OnlineLMConfig &config);
virtual std::vector<Ort::Value> GetInitStates() = 0;
virtual std::pair<Ort::Value, std::vector<Ort::Value>> GetInitStates() = 0;
/** Rescore a batch of sentences.
/** ScoreToken a batch of sentences.
*
* @param x A 2-D tensor of shape (N, L) with data type int64.
* @param y A 2-D tensor of shape (N, L) with data type int64.
* @param x A 2-D tensor of shape (N, 1) with data type int64.
* @param states It contains the states for the LM model
* @return Return a pair containingo
* - negative loglike
* - log_prob of NN LM
* - updated states
*
* Caution: It returns negative log likelihood (nll), not log likelihood
*/
virtual std::pair<Ort::Value, std::vector<Ort::Value>> Rescore(
Ort::Value x, Ort::Value y, std::vector<Ort::Value> states) = 0;
virtual std::pair<Ort::Value, std::vector<Ort::Value>> ScoreToken(
Ort::Value x, std::vector<Ort::Value> states) = 0;
// This function updates hyp.lm_lob_prob of hyps.
//
// @param scale LM score
// @param context_size Context size of the transducer decoder model
// @param hyps It is changed in-place.
void ComputeLMScore(float scale, int32_t context_size,
std::vector<Hypotheses> *hyps);
/** This function updates lm_lob_prob and nn_lm_scores of hyp
*
* @param scale LM score
* @param hyps It is changed in-place.
*
*/
virtual void ComputeLMScore(float scale, Hypothesis *hyp) = 0;
};
} // namespace sherpa_onnx